Python ctypes cannot open disk tray using mciSencCommand -

i'm seeking because cannot find why cannot open disk tray using python2.7 on windows 7 workstation.

i'm using simple code:

import ctypes ctypes.windll.winmm.mcisendstringw("set cdaudio door open",0,0,0) 

return value 292

i've checked on microsoft website , erro 292 stand mcierr_missing_device_name.

how can find right device_name make script works ?

thanks in advance, regards,